Clothes drying device and method for drying clothes

ABSTRACT

A clothes drying device and a method for drying clothes applying the device are provided. The clothes drying device comprises a drum body for accommodating clothes, an air duct for allowing air to flow and be dried and a condensing module and a semiconductor module. The condensing module comprises a heat absorbing portion and a heat releasing portion, the heat portion is arranged in the air duct to absorb heat from air in the drum body and to preliminarily condense moisture of air; the heat releasing portion is arranged outside the air duct to dissipate the heat absorbed by the heat absorbing portion to outside of the clothes drying device. The semiconductor module is arrange outside the air duct and comprises a cold end and a hot end, the cold end re-condenses moisture of air preliminarily condensed by the condensing module, the hot end heats the re-condensed air.

TECHNICAL FIELD

The present disclosure relates to a technical field of clothes drying, in particular, relates to a clothes drying device applying a semiconductor thermoelectric cooler and a method for drying clothes using the drying device to dry clothes.

BACKGROUND

A clothes drying device (e.g. a clothes dryer, a washer-dryer, etc.) generally comprises a clothes accommodating drum for accommodating the clothes to be dried, and a drying duct which is located outside the clothes accommodating drum and is communicated with the clothes accommodating drum. A drying airflow is blew into the clothes accommodating drum through the drying duct. When the drying airflow flows through the clothes accommodating drum, remained moisture of the clothes in the clothes accommodating drum is heated into water vapor, the water vapor flows out from the clothes accommodating drum and flows into the drying duct with the air, and the water vapor is condensed in the upstream section of the drying duct. The relatively dry air after condensation is continued to flow in the drying duct and flows into the clothes accommodating drum again for continuous circulation. The existing washer-dryer generally adopts the way of water cooling condensation, for the way of water cooling condensation, cold water is required to continuously be introduced into the drying duct during the clothes drying process, at the same time, the flow rate of the cold water in the drying duct is required to be controlled to be relatively small in order to save water as much as possible. Therefore, the condensing efficiency of the condensation way is relatively lower, and the water consumption of the condensation way is relatively larger. For the way of air condensation, it is required to use the room-temperature air outside the device to exchange heat with the humid and hot air in the drying duct. Since the way needs to exchange heat by the pipe wall, the condensation efficiency is quite lower, resulting in longer clothes drying time and higher energy consumption.

In order to solve the above problems, the invention patent No. 201210387889.4 discloses a condensing device and a dryer having the condensing device. The condensing device comprises a semiconductor thermoelectric cooler. Two sides of the semiconductor thermoelectric cooler are respectively connected with a hot end heat releasing sheet and a cold end heat absorbing heat by a heat conducting block. A thermal insulating material is filled between the hot end heat releasing sheet and the cold end heat absorbing sheet to isolate the heat conduction of the hot end heat releasing sheet and the cold end heat absorbing sheet. The dryer also comprises a drying chamber and a circulating air duct of which two ends are communicated with the drying chamber. The condensing device is installed in the circulating air duct. During the flowing of the air in the circulating air duct, the air flows through the cold end heat absorbing sheet of the condensing device to be subject to condensation and dehumidification, in turn, flows through the hot end heat releasing sheet to be heated, and then, returns to the drying chamber. However, the device exists the following deficiencies:

First of all, although the semiconductor thermoelectric cooler has two functions, i.e. both cooling and heating, the cooling power of a single cooling element of the semiconductor thermoelectric cooler is normal. It needs a plurality of unit components to meet the condensation requirements, which will increase the manufacturing cost or energy consumption.

Moreover, in order to further improve the condensing effect, some clothes drying device only utilizes the heating function of the semiconductor module, a condensing device is separately arranged in the circulating duct, and the condensing device must depend on the cold source (such as electric driving, etc.) to achieve the cooling effect. For example, a Chinese invention patent No. 201210008372.X discloses a new type of dryer, which comprises a case and an inner drum, and also comprises an air duct, a semiconductor thermoelectric cooler, a condenser and an evaporator. The inner drum is communicated with the air duct through a communication pipe assembly, the condenser and the evaporator are located in the air duct. A hot end of the semiconductor thermoelectric cooler is connected with the condenser through a first heat exchange pipe, and a cold end of the semiconductor thermoelectric cooler is connected with the evaporator through a second heat exchange pipe. The communication pipe assembly is provided with a driving device for making the air in the communication pipe assembly, the air duct and the inner drum flow, the air duct is provided with a water removing pipe. Because of the condenser separately arranged, not only the cooling function of the semiconductor thermoelectric cooler wastes, but also the cost and energy consumption increase.

In view of this, the present disclosure is proposed.

SUMMARY

The first object of the present disclosure is to provide a clothes drying device which utilizes the heat transfer principle and can cooperate with a semiconductor module without a cold source to achieve an optimal effect of air condensation and heating. The second object of the present disclosure is to provide a method for drying clothes by applying the above clothes drying device.

In order to achieve the first object of the present disclosure, the technical scheme is adopted as follows: a clothes drying device, comprising a drum body for accommodating clothes, an air duct for allowing air to flow and be dried, a condensing module and a semiconductor module.

The condensing module comprises a heat absorbing portion and a heat releasing portion, the heat absorbing portion is arranged in the air duct to absorb heat from air in the drum body and to preliminarily condense the air; the heat releasing portion is arranged outside moisture of air duct to dissipate the heat absorbed by the heat absorbing portion to outside of the clothes drying device;

the semiconductor module is arranged in the air duct and comprises a cold end and a hot end, the cold end re-condenses moisture of air preliminarily condensed by the condensing module, the hot end heats the re-condensed air.

After humid and hot air enters into the air duct, the heat absorbing portion of the condensing module uses the heat transfer effect to absorb heat from the air and transfer the heat to the heat releasing portion, and the heat releasing portion dissipates the heat to the outside of the device, and that forms a condensing circulation. No other cold source is needed. And the circulation is performed rapidly, the heat can be continuously transferred, and the water vapor in the humid and hot air can be efficiently condensed. After preliminarily condensation, secondary condensation is performed by the semiconductor module, thus, the removal rate of the water vapor in the air is ensured, and the clothes drying efficiency is further improved. In addition, the condensed air is heated by using the Peltier effect of the semiconductor module, and eventually returns to the drum body for drying clothes, as so to reduce energy consumption while efficiently drying clothes.

Preferably, the air duct is provided with a chamber formed by outwardly protruding of a side wall of the air duct, the semiconductor module is arranged in the chamber, the cold end faces an air inlet of the chamber, and the hot end faces an air outlet of the chamber; the air passing through the chamber in the air duct enters into the chamber through the air inlet after being condensed by the cold end, then is heated by the hot end and flows into next section of the air duct through the air outlet.

Preferably, the air duct is provided with a horizontal pipe, a side wall of the horizontal pipe is provided with an outwardly expanding section protruding downwards to form a transverse D-shaped chamber in the horizontal pipe, two sides of an upper part of the transverse D-shaped chamber are respectively the air inlet in a horizontal direction and the air outlet in a vertical direction, the air outlet is communicated with a vertical pipe, the semiconductor module is arranged between the air inlet and the air outlet, a drainage outlet is arranged at a bottom of the transverse D-shaped chamber.

Preferably, the semiconductor module also comprises multilayer heat absorbing fins vertically arranged at the cold end and multilayer heat releasing fins vertically arranged at the hot end, gaps between the multilayer heat absorbing fins form an air inlet passage facing the air inlet, gaps between the multilayer heat releasing fins form an air outlet passage facing the air outlet, the air entering into the air inlet is blocked by the cold end in the air let passage and then turns down to enter into the chamber, and then is guided upwards by an inner wall of the chamber, and flows out of the chamber through the air outlet passage and the air outlet, to form a U-shaped ventilation trajectory.

Preferably, the condensing module is provided with a closed chamber, the closed chamber contains working fluid, the heat absorbing portion preliminarily condenses moisture of air by heat absorption and evaporation of the working fluid, the heat releasing portion dissipates the heat by condensation of the working fluid. The condensation of the humid and hot air in the air duct is completely realized by the phase change principle that the fluid is evaporated to absorb heat and is condensed to release heat, not only the structure is simple, but also the heat transfer speed is rapid.

Preferably, the condensing module comprises a heat pipe having an evaporation section and an condensation section, the evaporation section and the condensation section of the heat pipe are both provided with a heat exchange sheet group, the evaporation section and the heat exchange sheet group form the heat absorbing portion, the condensation section and the heat exchange sheet group form the heat releasing portion.

Preferably, an axial fan is arranged on the heat exchange sheet group of the condensation section of the heat pipe, airflow of the axial fan dissipates heat of gaps between heat exchange sheets to further improve the heat dissipation efficiency.

Preferably, the condensing module comprises a vapor chamber having an evaporation sector and a condensation sector, the evaporation sector forms the heat absorbing portion, and the condensation sector forms the heat releasing portion.

Preferably, the air duct comprises an air exhausting pipe, a condensing passage, an air returning pipe and a drying passage connected in sequence, the air in the drum body enters into the air duct through the air exhausting pipe, the heat absorbing portion of the condensing module is located in the condensing passage, the semiconductor module is located in the air returning pipe, the drying passage is connected with the drum body, and a fan for allowing air to circulate is arranged in the drying passage.

Preferably, the drainage outlet is arranged at a bottom of the condensing passage.

Preferably, a heater for reheating the air is arranged in the drying passage. The air is re-heated to further improve the clothes drying efficiency.

In order to achieve the second object of the present disclosure, the technical scheme is adopted as follows:

A method for drying clothes in the clothes drying device, comprising the following steps:

supplying the air for drying the clothes into the drum body, taking moisture of the clothes away from the drum body by the air to form humid and hot air and the humid and hot air entering into the air duct;

absorbing the heat of the air in the air duct by the heat absorbing portion of the condensing module, dissipating the heat from the air to the outside of the device by the heat releasing portion of the condensing module, and the air being preliminarily condensed;

and then re-condensing the air by the cold end of the semiconductor module, the re-condensed air being heated by the hot end of the semiconductor module, and eventually returning to the drum body to dry clothes again.

By adopting the above technical scheme, the present disclosure has the following benefits:

The condensation circulation is realized by using the heat transfer effect and the principle of phase transition. No other cold source is needed. And the circulation is performed rapidly, the heat can be continuously transferred, and the water vapor in the humid and hot air can be efficiently condensed. After preliminarily condensation, secondary condensation is performed by the semiconductor module, thus, the removal rate of the water vapor in the air is ensured, and the clothes drying efficiency is further improved. In addition, the condensed air is heated by using the Peltier effect of the semiconductor module, and eventually returns to the drum body for drying clothes, as so to reduce energy consumption while efficiently drying clothes.

BRIEF DESCRIPTION OF THE DRAWINGS

As one part of the present disclosure, the drawings are used for providing further understanding for the present disclosure; and schematic embodiments and descriptions thereof of the present disclosure are used for explaining the present disclosure without forming improper restriction to the present disclosure. Apparently, the drawings described below are only some embodiments, and other drawings can be obtained by those having ordinary skill in the art according to these drawings on the premise of not making inventive labor. In the drawings:

FIG. 1 is a front view of a clothes drying device in an embodiment of the present disclosure;

FIG. 2 is a structure schematic diagram of the clothes drying device in an embodiment of the present disclosure;

FIG. 3 is a side view of the clothes drying device in an embodiment of the present disclosure;

FIG. 4 is a structure schematic diagram of a heat pipe and a condensing passage of the clothes drying device in an embodiment of the present disclosure;

FIG. 5 is a structure and principle schematic diagram of the heat pipe of the clothes drying device in an embodiment of the present disclosure;

FIG. 6 is a structure schematic diagram of a semiconductor module of the clothes drying module in an embodiment of the present disclosure;

FIG. 7 is structure and principle schematic diagram of a vapor chamber of the clothes drying device in another embodiment of the present disclosure.

Wherein: 1. drum body, 2. air duct, 21. air exhausting pipe, 22. condensing passage, 23. air returning pipe, 231. D-shaped chamber, 24. drying passage, 3. condensing module, 4. semiconductor module, 41. cold end, 42. hot end, 43. heat absorbing fins, 44. heat releasing fins, 5. heat pipe, 551. pipe shell, 552. fluid absorbing wick, 51. evaporation section, 52. condensation section, 6. axial fan, 7. fan, 8. vapor chamber, 81. evaporation sector, 82. condensation sector, 9. heater.

It is necessary to note that these drawings and word descriptions are not aimed at restricting the concept scope of the present disclosure in any way, but declaring the conception of the present disclosure to those skilled in the art through referring to specific embodiments.

DETAILED DESCRIPTION

To make the objects, technical schemes and advantages of the embodiments of the present disclosure clearer, the technical schemes of the embodiments are clearly and completely described below with reference to the drawings of the embodiments of the present disclosures; and the following embodiments are used for describing the present disclosure, but not limiting the scope of the present disclosure.

In the description of the present disclosure, it is necessary to note that orientation or position relationships indicated by terms such as ‘up’, ‘down’, ‘front’, ‘back’, ‘left’, ‘right’, ‘vertical’, ‘interior’ and ‘exterior’ are orientation or position relationships shown on the basis of the drawings, are only used for conveniently describing the present disclosure and simplifying description without indicating or suggesting that appointed devices or elements must have specific orientations or be constructed and operated at the specific orientations. Therefore, the terms cannot be understood to limit the present disclosure.

In the description of the present disclosure, it is necessary to note that except for additional definite provision and restriction, terms such as ‘mounting’, ‘connection’ and ‘connecting’ should be generally understood. For example, ‘connection’ may be fixed connection, detachable connection or integrated connection; ‘connection’ may be mechanical connection or electric connection; and ‘connection’ may be direct connection or intermediate-medium indirect connection. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in the present disclosure can be understood according to particular cases.

Embodiment 1

As shown in FIG. 1 and FIG. 2, a clothes drying device comprises a drum body 1 for accommodating clothes and an air duct 2 for allowing air to flow and be dried, the clothes drying device also comprises a condensing module 3 and a semiconductor module 4.

The condensing module 3 comprises a heat absorbing portion and a heat releasing portion. The heat absorbing portion is arranged in the air duct 2 to absorb the heat from the air in the drum body 1 and to preliminarily condense moisture of air. The heat releasing portion is arranged outside the air duct 2 to absorb the heat from the heat absorbing portion and dissipate the heat to the exterior of the device.

The semiconductor module 4 is arranged in the air duct 2, and comprises a cold end 41 and a hot end 42. The cold end 41 condenses moisture of air preliminarily condensed by the condensing module 3 again, and the heat end 42 heats the re-condensed air.

After humid and hot air enters into the air duct, the heat absorbing portion of the condensing module 3 uses the heat transfer effect to absorb heat from the air and transfer the heat to the heat releasing portion, and the heat releasing portion dissipates the heat to the exterior of the device, and that forms a condensing circulation. No other cold source is needed. And the circulation is performed rapidly, the heat can be continuously transferred, and the water vapor in the humid and hot air can be efficiently condensed. After preliminarily condensation, secondary condensation is performed by the semiconductor module 4, thus, the removal rate of the water vapor in the air is ensured, and the clothes drying efficiency is further improved. In addition, the condensed air is heated by using the Peltier effect of the semiconductor module 4, and eventually returns to the drum body for drying clothes, as so to reduce energy consumption while efficiently drying clothes.

Embodiment 2

As a further preferred implementation mode of the embodiment of the present disclosure, the air duct 2 is provided with a chamber which is formed by outwardly protruding of a side wall of the air duct. The semiconductor module 4 is arranged in the chamber, a cold end 41 faces an air inlet of the chamber, and a hot end 42 faces an air outlet of the chamber. The air passing through the chamber in the air duct 2 enters into the chamber through the air inlet after being condensed by the cold end 41, then is heated by the hot end 42 and is introduced into next section of the air duct through the air outlet.

As shown in FIG. 2, as a further preferred implementation mode of the embodiment of the present disclosure, the air duct 2 comprises a horizontal pipe, a side wall of the horizontal pipe comprises an outwardly expanding section protruding downwards to form a transverse D-shaped chamber 231. Two sides of the upper part of the chamber are respectively the air inlet in a horizontal direction and the air outlet in a vertical direction, the air outlet is communicated with a vertical pipe. The semiconductor module 4 is arranged between the air inlet and the air outlet. The bottom of the chamber is provided with a drainage outlet. The vertical air inlet and the horizontal air outlet can ensure the fluently air circulation.

As shown in FIG. 2 and FIG. 6, as a further preferred implementation mode of the embodiment of the present disclosure, the semiconductor module 4 also comprises: multilayer heat absorbing fins 43 which is vertically installed at the cold end and multilayer heat releasing fins 44 which is vertically installed at the hot end. The gaps between the multiple heat absorbing fins 43 form an air inlet passage facing the air inlet, and the gaps between the multilayer heat releasing fins 44 form an air outlet passage facing the air outlet. The air entering in through the air inlet is blocked by the cold end 41 in air inlet passage and then turns down to enter into the chamber, and is guided upwards by an inner wall of the chamber, and then flows out of the chamber through the air outlet passage and the air outlet, to form a U-shaped ventilation trajectory.

Embodiment 3

As a further preferred implementation mode of the embodiment of the present disclosure, the condensing module comprises a closed chamber, the chamber contains working fluid. The heat absorbing portion preliminarily condenses moisture of air by heat absorption and evaporation of the working fluid, the heat releasing portion dissipates the heat by condensation of the working fluid. The condensation of the humid and hot air in the air duct is completely realized by the phase change principle that the fluid is evaporated to absorb heat and is condensed to release heat, not only the structure is simple, but also the heat transfer speed is rapid.

As shown in FIG. 5, as a further preferred implementation mode of the embodiment of the present disclosure, the condensing module comprises a heat pipe 5 having an evaporation section 51 and a condensation section 52. The evaporation section 51 and the condensation section 52 of the heat pipe 5 are both provided with a heat exchange sheet group. The evaporation section 51 and the heat exchange sheet group form a heat absorbing portion, the condensation section 52 and the heat exchange sheet group form a heat releasing portion.

As shown in FIG. 5, the heat pipe 5 is composed of a pipe shell 511 and a fluid absorbing wick 552. An appropriate amount of working fluid is introduced, after pumping the pipe until the pressure in the pipe is negative, so that a capillary porous material of the fluid absorbing wick clinging to the inner wall of the pipe is filled with fluid and then is sealed. One end of the pipe is the evaporation section 51, the other end is the condensation section 52, and an insulation section can be arranged between these two ends according to application needs. When heating the evaporation section 51 of the heat pipe 5, the working fluid in the wick is heated and evaporated, heat around is taken away, and the heat is the latent heat of evaporation of the working fluid, the vapor flows to the condensation section 52 of the heat pipe from the central passage to be condensed into fluid, and releases the latent heat at the same time, the fluid returns to the evaporation section 51 under the action of the capillary force. In this way, a closed circulation is completed, so that a large amount of heat is transferred to the heat releasing portion from the heat absorbing portion.

As shown in FIG. 4, as a further preferred implementation mode of the embodiment of the present disclosure, an axial fan 6 is arranged on the heat exchange sheet group of the condensation section 52 of the heat pipe, to further improve the heat dissipation efficiency.

Embodiment 4

As shown in FIG. 1, as a further preferred implementation mode of the embodiment of the present disclosure, the air duct 2 comprises an air exhausting pipe 21, a condensing passage 22, an air returning pipe 23 and a drying passage 24 which are connected in turn. The air in the drum body 1 enters into the air duct 2 through the air exhausting pipe 21. The heat absorbing portion of the condensing module 3 is located inside the condensing passage 22. The semiconductor module 4 is located in the air returning pipe 23. The drying passage 24 is connected with the drum body 1 and a fan 7 for making air to circulate is arranged in the drying passage 24.

The outwardly expanding section is arranged at the air returning pipe 23, and the outwardly expanding section comprises the air inlet and the air outlet. The air inlet is connected with the condensing passage 22, and the air outlet is connected with the drying passage 24. The heat absorbing fins 43 of the semiconductor module is arranged near the air inlet, the heat releasing fins 44 is arranged near the air outlet. The air after being preliminarily condensed enters into the outwardly expanding section, is condensed and heated again in the D-shaped chamber of the outwardly expanding section, and enters into the drying passage 24 through the air outlet.

As shown in FIG. 2, as a further preferred implementation mode of the embodiment of the present disclosure, a heater 9 using for reheating the air is arranged in the drying passage 24. The air is reheated to further improve the clothes drying efficiency.

Embodiment 5

As shown in FIG. 7, the differences between the present embodiment and the above embodiments are as follows: the condensing module 3 comprises a vapor chamber 8 which has an evaporation sector 81 and a condensation sector 82. The evaporation sector 81 forms the heat absorbing portion of the condensing module 3, and the condensation sector 82 forms the heat releasing portion of the condensing module 3.

The working principle of the vapor chamber 8 is same with that of the heat pipe, and the working principle of the vapor chamber 8 comprises four main steps, i.e. conduction, evaporation, convection and condensation. The vapor chamber 8 is a dual-phase fluid device which is formed by the mode that pure water is injected into a container full of micro structures. The heat enters the vapor chamber from the outer high-temperature zone through heat conduction, the water around point heat source quickly absorbs the heat and vaporizes into the vapor, and a large amount of heat energy is taken away. Then using the latent heat ability of the vapor, the vapor in the vapor chamber diffuses to low-pressure zone from high-pressure zone, when the vapor is in contact with the inner wall with lower temperature, the vapor is quickly condensed into liquid and release heat energy. The condensed water flows back to the point heat source by the capillary action of the micro structures, to complete a heat transfer cycle and to form a dual-phase circulation system that the water and the vapor coexist. The vaporization of the water in the vapor chamber is continued to be carried out, the pressure in the vapor chamber will maintain equilibrium with the change of the temperature. The value of the thermal conductivity coefficient is relatively low when the water operates at a lower temperature, but the vapor chamber can also operate at 5° C. or 10° C. because the viscosity of the water will change at different temperature. Because the backflow of the liquid depends on the capillary action, the vapor chamber is less affected by gravity, so that the design space of the application system can be used at any angle. The vapor chamber needs no power and any moving components, and the vapor chamber is a completely sealed passive device.

Embodiment 6

A method for drying clothes adopting the clothes drying device of the above embodiments, comprises the following steps:

supplying air for drying clothes into the drum body 1, taking moisture of the clothes away from the drum body 1 by the air to form humid and hot air, and the humid and hot air enters into the air duct 2.

The heat of the air entering into the air duct is absorbed by the heat absorbing portion of the condensing module 3, the absorbed heat of the air is dissipated to the outside of the device by the heat releasing portion of the condensing module 3, the air is preliminary condensed.

Then the preliminary condensed air is re-condensed by the cold end 41 of the semiconductor module 4, the condensed air is heated by the hot end 42 of the semiconductor module, and the air eventually returns to the drum body 1 to dry clothes again.

The implementation solutions of the foregoing embodiments can be further combined or replaced. The embodiments are merely the description of the preferred embodiments of the present invention, but are not intended to limiting the conception and scope of the present invention. Without departing from the scope of the technical solution of the present invention, any changes and modifications made according to the technical essence of the present invention by any persons skilled in the present invention shall all be covered within the scope of the technical solution of the present invention. 

1. A clothes drying device, comprising a drum body for accommodating clothes, an air duct for allowing air to flow and be dried, a condensing module and a semiconductor module, wherein: the condensing module comprises a heat absorbing portion and a heat releasing portion, the heat absorbing portion is arranged in the air duct to absorb heat from air in the drum body and to preliminarily condense moisture of air; the heat releasing portion is arranged outside the air duct to dissipate the heat absorbed by the heat absorbing portion to outside of the clothes drying device; the semiconductor module is arranged in the air duct and comprises a cold end and a hot end, the cold end re-condenses moisture of air preliminarily condensed by the condensing module, the hot end heats the re-condensed air.
 2. The clothes drying device according to claim 1, wherein the air duct is provided with a chamber formed by outwardly protruding of a side wall of the air duct, the semiconductor module is arranged in the chamber, the cold end faces an air inlet of the chamber, and the hot end faces an air outlet of the chamber; the air passing through the chamber in the air duct enters into the chamber through the air inlet after being condensed by the cold end, then is heated by the hot end and flows into next section of the air duct through the air outlet.
 3. The clothes drying device according to claim 1, wherein the air duct is provided with a horizontal pipe, a side wall of the horizontal pipe is provided with an outwardly expanding section protruding downwards to form a transverse D-shaped chamber in the horizontal pipe, two sides of an upper part of the transverse D-shaped chamber are respectively the air inlet in a horizontal direction and the air outlet in a vertical direction, the air outlet is communicated with a vertical pipe, the semiconductor module is arranged between the air inlet and the air outlet, and a first drainage outlet is arranged at a bottom of the transverse D-shaped chamber.
 4. The clothes drying device according to claim 3, wherein the semiconductor module comprises multilayer heat absorbing fins vertically arranged at the cold end and multilayer heat releasing fins vertically arranged at the hot end, gaps between the multilayer heat absorbing fins form an air inlet passage facing the air inlet, gaps between the multilayer heat releasing fins form an air outlet passage facing the air outlet, the air entering into the air inlet is blocked by the cold end in the air let passage and then turns down to enter into the chamber, and then is guided upwards by an inner wall of the chamber, and flows out of the chamber through the air outlet passage and the air outlet, to form a U-shaped ventilation trajectory.
 5. The clothes drying device according to claim 1, wherein the condensing module is provided with a closed chamber, the closed chamber contains working fluid, the heat absorbing portion preliminarily condenses moisture of air by heat absorption and evaporation of the working fluid, and the heat releasing portion dissipates the heat by condensation of the working fluid.
 6. The clothes drying device according to claim 5, wherein the condensing module comprises a heat pipe having an evaporation section and an condensation section, the evaporation section and the condensation section of the heat pipe are both provided with a heat exchange sheet group, the evaporation section and a first heat exchange sheet group form the heat absorbing portion, and the condensation section and a second heat exchange sheet group form the heat releasing portion.
 7. The clothes drying device according to claim 6, wherein an axial fan is arranged on the heat exchange sheet group of the condensation section of the heat pipe, airflow of the axial fan dissipates heat of gaps between heat exchange sheets.
 8. The clothes drying device according to claim 5, wherein the condensing module comprises a vapor chamber having an evaporation sector and a condensation sector, the evaporation sector forms the heat absorbing portion, and the condensation sector forms the heat releasing portion.
 9. The clothes drying device according to claim 1, wherein the air duct comprises an air exhausting pipe, a condensing passage, an air returning pipe and a drying passage connected in sequence, the air in the drum body enters into the air duct through the air exhausting pipe, the heat absorbing portion of the condensing module is located in the condensing passage, the semiconductor module is located in the air returning pipe, the drying passage is connected with the drum body, and a fan for allowing air to circulate is arranged in the drying passage.
 10. The clothes drying device according to claim 9, wherein a second drainage outlet is arranged at a bottom of the condensing passage.
 11. The clothes drying device according to claim 9, wherein a heater for reheating the air is arranged in the drying passage.
 12. A method for drying clothes in the clothes drying device of claim 1, comprising the following steps: supplying air for drying the clothes into the drum body, taking moisture of the clothes away from the drum body by the air to form humid and hot air, and the humid and hot air entering into the air duct; absorbing the heat of the air in the air duct by the heat absorbing portion of the condensing module, dissipating the heat from the air to the outside of the device by the heat releasing portion of the condensing module, and the air being preliminarily condensed; and then re-condensing the air by the cold end of the semiconductor module, the re-condensed air being heated by the hot end of the semiconductor module, and eventually returning to the drum body to dry clothes again.
 13. The clothes drying device according to claim 2, wherein the air duct is provided with a horizontal pipe, a side wall of the horizontal pipe is provided with an outwardly expanding section protruding downwards to form a transverse D-shaped chamber in the horizontal pipe, two sides of an upper part of the transverse D-shaped chamber are respectively the air inlet in a horizontal direction and the air outlet in a vertical direction, the air outlet is communicated with a vertical pipe, the semiconductor module is arranged between the air inlet and the air outlet, and a first drainage outlet is arranged at a bottom of the transverse D-shaped chamber. 